\tikzset{
/Flow diagram/.style={
% Node placement
auto,
node distance=14mm and 14mm,
on grid,
% Edge style
thick,
->,
>=Stealthy[round],
% Node border styles
rectangle/.style={shape=rectangle, draw, rounded corners, minimum size=8mm},
state/.style={shape=circle, draw, inner sep=0pt, minimum size=6.8mm},
no_border/.style={shape=rectangle, inner sep=1pt},
% Node fill styles
unobserved/.style={},
intervention/.style={dcolorb, very thick, fill=dcolorb!30},
observation/.style={dcoloro, very thick, fill=dcoloro!30},
%
annotation_brace/.style={-,decoration={brace,amplitude=7pt},decorate,thick,color=ann_col},
%
roundline/.style={rounded corners=4mm}
},
}
